Also the heuristics can be exploited to create a unique identifier for your browser, so it’s not a flawless solution.

I don’t understand…

Eb Games and Kmart are both huge in Australia

That guy’s seriously talented!
Among the things he’s made, he’s also made some really nice, easy to understand, high-speed compression formats (QOI/QOA), as well as a public domain mpeg decoder.

I’ve used all three for various projects and I’d highly recommend that most software developers check them out. If only for the learning experience.